Support N distributed agents

This is the third main feature of this system. The code needs a bunch of
polish, but it actually all works :)

I've tested this briefly with N <= 3.

Currently you have to build your own etcd cluster. It's quite easy, just
run `etcd` and it will be ready. I usually run it in a throw away /tmp/
dir so that I can blow away the stored data easily.

event.go

@@ -24,11 +24,8 @@ const (
 	eventExit eventName = iota
 	eventStart
 	eventPause
-	eventContinue
 	eventPoke
 	eventChanged
-	//eventPaused
-	eventStarted
 )
 
 type Event struct {